S. Lu and Y. L. Chang 1 concerning the structure of vitreous silica. Two main claims are made. First, that the X-ray diffraction pattern of a thin plate of vitreous silica differs from that of the ...
What Is Posterior Vitreous Detachment? Posterior vitreous detachment (PVD) is an eye condition that naturally happens with age, when gel that usually fills your eyeball detaches from your retina.